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Relative velocity in Mean Free Path problems

  1. Nov 12, 2008 #1
    Why is average relative velocity equal to the square root of 2 times the magnitude of the x direction velocity?

    I'm trying to solve some problems that deal with gas laws from Ideal gases to the Van der Waals gases.

    Does anybody have any ideas?

  2. jcsd
  3. Aug 25, 2010 #2
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